Effects of Compressive Stress on Fluorescent Penetrant Indications of Fatigue Cracks in Titanium
Abstract
Although it has been generally accepted that compressive stress adversely affects the fluorescent penetrant indications of fatigue cracks, published supporting data was lacking. To begin to fill this data void, five titanium specimens containing low cycle fatigue cracks were repetitively processed with a standardized liquid penetrant procedure after known stresses had been applied. A fixture was designed to apply known amounts of compressive stress on the cracked surfaces over the range of 0 to 63.5 ksi. The penetrant indications were measured and analyzed with two independent techniques. Eddy current inspection data were also generated for comparison with the penetrant data. The liquid penetrant indications began to diminish immediately with the application of compressive stress. On the other hand, the amplitudes of the eddy current indications remained the same over the entire range of applied stress.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2001
- Accession Number
- ADA404873
Entities
People
- John C. Brausch
- Noel A. Tracy
Organizations
- Universal Technology Corporation (United States)